| Organism | Associated Diseases |
|---|---|
| Bacteria | |
| Klebsiella granulomatis | Donovanosis (granuloma inguinale) |
| Campylobacter species | Enteritis, proctocolitis |
| Chlamydia trachomatis | Genital tract infections and Reiter's syndrome |
| Gardnerella vaginalis | Bacterial (nonspecific) vaginosis |
| Group B streptococcus | Neonatal sepsis |
| Haemophilus ducreyi | Chancroid |
| Mycoplasma hominis | Postpartum fever; meningitis |
| Neisseria gonorrhoeae | Genital tract infections, disseminated gonococcal infection |
| Shigella species | Shigellosis; gay bowel syndrome |
| Treponema pallidum | Syphilis |
| Ureaplasma urealyticum | Nongonococcal urethritis |
| Viruses | |
| Cytomegalovirus | Heterophile-negative infectious mononucleosis, birth defects, protean manifestations in the immunocompromised host |
| Hepatitis A | Acute hepatitis |
| Hepatitis B | Acute and chronic hepatitis B, cirrhosis, hepatocellular carcinoma |
| Hepatitis C | Acute and chronic hepatitis, cirrhosis, hepatocellular carcinoma |
| Herpes simplex | Genital herpes, aseptic meningitis |
| Human herpesvirus, type 8 | Kaposi's sarcoma, lymphoma |
| Human immunodeficiency virus types 1 and 2 | AIDS (acquired immunodeficiency syndrome) |
| Human papilloma (70 separate types) | Condyloma acuminata, cervical intraepithelial neoplasia and carcinoma, vulvar carcinoma, penile carcinoma |
| Human T-lymphotrophic retrovirus, type 1 | Human T-cell leukemia or lymphoma |
| A pox virus | Genital molluscum contagiosum |
| Protozoa | |
| Entamoeba histolytica | Amebiasis in people who have oroanal sex |
| Giardia lamblia | Giardiasis in people who have oroanal sex |
| Trichomonas vaginalis | Trichomonal vaginitis |
| Ectoparasites | |
| Phthirus pubis | Pubic lice infestation |
| Sarcoptes scabiei | Scabies |
NOTE: Many of these diseases can be transmitted by contact that is not sexual.